McCunn is a surname, originating in Scotland but now widespread in many countries across the world.
The surname is probably a variant of 'McCune', the Anglicised form of 'MacEoghainn'. The personal name 'Eoghain' is a Gaelic form of the Latin 'Eugenius', meaning 'noble', borne by a third-century bishop and martyr. Another theory suggests McCunn as a variant of 'McKeown', which comes from the Celtic 'Mac Eoin' ('Eoin' being the Irish form of John).
The first recorded bearer of the name was Gilcrist McKwnne, circa 1370, in the Calendar of the Laing Charters during the reign of King David II of Scotland. The surname was introduced to Ulster by Scottish settlers during the plantation of the province and later many McCunns emigrated during the Great Famine of Ireland. Since then, the McCunn family has spread throughout the world particularly to North America.